Abstract: Tazhong No.1 slope break as a typical karst cavern body is a very favorable domain for hydrocarbon accumulation of the Ordovician carbonate reservoir in Tazhong area, Tarim basin. The feature of fractures and caves is characterized by string beads-like reflection in seismic profile. The methods for prediction of the small-sized caves and fractures developing zones in seismic processing include amplitude-preserved prestack gather processing, noise-removal approach, well-control treatment to improve deconvolution effect in purpose of increasing resolution of the Ordovician inside information. Also, the inside reflection feature of Tazhong Ordovician is further improved using anisotropic prestack time migration technique.

Key words: carbonate reservoir, seismic data processing, relative amplitude remaining, well-control treatment, anisotropy, prestack time migration